Department of Chemical Engineering, University of Las Villas, Sta. Clara, Cuba.
J Environ Sci Health A Tox Hazard Subst Environ Eng. 2012;47(7):990-6. doi: 10.1080/10934529.2012.667308.
The biological removal of hydrogen sulfide at low concentration (<120 ppmv) was studied in a laboratory-scale biofilter packed with sugarcane bagasse and inoculated with a sulfur-oxidizing bacterial consortium isolated from activated sludge from a wastewater treatment plant (WWTP). Inlet loads from 1.31 to 20.2 g Sm(-3) h(-1) were supplied to the biofilter, and empty bed residence times (EBRTs) of 30, 20 and 10 s were tested. In all cases, the removal efficiency was greater than 99%. Two methods for the pH control were tested: increasing the phosphate buffer capacity of the mineral medium (method I), and a new method, which involves the addition of solid CaCO(3) to the bagasse at the upper inlet of the biofilter (method II). For method I, pH increased gradually along the bed (from the bottom to the top), from a constant value of 3.0 to 7.0. For method II, pH was constant (2.4 ± 0.8) along the bed, and then a steep increase of pH was observed at the top to 7.1. We suggest the use of CaCO(3) instead of phosphate buffer because the former is less expensive, it is a simple method and the results obtained with the two methods are similar.
在实验室规模的生物过滤器中，用甘蔗渣填充并接种从污水处理厂（WWTP）的活性污泥中分离出的硫磺氧化细菌混合物，研究了低浓度（<120ppm）的硫化氢的生物去除。生物过滤器提供了从 1.31 到 20.2 g Sm(-3) h(-1) 的入口负荷，并且测试了 30、20 和 10 s 的空床停留时间（EBRT）。在所有情况下，去除效率均大于 99%。测试了两种 pH 控制方法：增加矿物培养基的磷酸盐缓冲能力（方法 I）和一种新方法，即在生物过滤器的上部入口处向甘蔗渣中添加固体 CaCO(3)（方法 II）。对于方法 I，pH 值沿着床层逐渐升高（从底部到顶部），从恒定的 3.0 增加到 7.0。对于方法 II，pH 值在床层上保持不变（2.4 ± 0.8），然后在顶部观察到 pH 值急剧增加到 7.1。我们建议使用 CaCO(3)代替磷酸盐缓冲剂，因为前者更便宜，是一种简单的方法，并且两种方法得到的结果相似。
